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Thread: Another way to test CYA?

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    surfhawaii's Avatar
    Join Date
    May 2011
    Kailua, Hawaii

    Another way to test CYA?

    I have the Taylor K-2006 kit and love it except for the CYA test. Just seems I get different readings depending on lighting, my eyes, bubbles, exactly when black dot disappears, you name it. Is there another test kit or process that does this easier?
    24.5k gallon
    Sand filter (Triton II TR 100)
    IG tile
    Pentair VS+SVRS pump
    Sundance Chelsee spa

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    Mod Squad zea3's Avatar
    Join Date
    Jul 2009
    Houston, Texas

    Re: Another way to test CYA?

    Unfortunately CYA is the more difficult value to test. Try to standardize things as much as possible. Read the test around the same time of day, in strong sunlight with the sun at your back holding the tube at waist level. Follow measuring and mixing directions to the letter. When you think you see no sign of the dot, look away for a minute and look again. Pour the mixture into the mixing vial then back into the view tube and read the test again 2 more times and pick the 2 closest numbers as your result. Even under the best of circumstances the error rate on the result is +/- 10 ppm.

    Once you have a result you should only need to retest when you have added more CYA, replaced a significant amount of water, or notice a change in the way the pool responds to chlorine.
    TFP Moderator
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    Vogue 21' round AG, Pentair 1 hp 2 speed pump, 36 sq ft DE filter, Hayward S180T 150# sand filter, Houston, Texas
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    Join Date
    Jul 2011
    Central Califorina

    Re: Another way to test CYA?

    Thank you both for the question and answer. I too have difficulty reading the CYA test. I think you advice will help.
    3500 gallon 14x42 Intex Ultra Frame
    1/2 HP Intex 1600 sand filter/pump - Intex SWCG
    Two 4x20 Fafco solar panels.
    Taylor K-2006
    Marquis spirit hot tub - Grill Dome ceramic grill/smoker

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